A091332 Natural numbers written out with their digits grouped in sets of four (leading zeros omitted).

1234, 5678, 9101, 1121, 3141, 5161, 7181, 9202, 1222, 3242, 5262, 7282, 9303, 1323, 3343, 5363, 7383, 9404, 1424, 3444, 5464, 7484, 9505, 1525, 3545, 5565, 7585, 9606, 1626, 3646, 5666, 7686, 9707, 1727, 3747, 5767, 7787, 9808, 1828, 3848, 5868, 7888

Offset: 1

Author

J. Taylor (integersfan(AT)yahoo.com), Mar 01 2004

Keywords

• base
• easy
• nonn

Links

• Rémy Sigrist, Table of n, a(n) for n = 1..10000

Crossrefs

Cf. A059805, A091331.

Programs

PARI

{c=0; d=[]; for(n=1, 99, while(#d<4, d=concat(d, digits(c++))); print1(sum(i=1,4,d[i]*10^(4-i))", "); d=vecextract(d, "^..4"))} \\ M. F. Hasler, Oct 23 2014